Why Does Concrete Sink? The Most Common Causes of Settling Concrete in Michigan

If you live in a Michigan subdivision, you've probably seen it: a front step that has dropped down from the porch, a service walk with a lip that catches your toe, a back patio that slopes toward the foundation, or driveway slabs that have dropped below the garage floor. Sinking concrete is one of the most common problems homeowners face across Southeast and Central Michigan, and it rarely happens without a reason.

At MI Concrete Lifting, we've been raising and leveling concrete since 2009, and we see the same causes over and over in Howell, Brighton, and communities throughout Livingston, Wayne, Oakland, and Washtenaw counties. Here's what's really going on underneath your slabs, and what can be done about it without tearing everything out.

The Number One Cause: Original Construction and Poor Base Preparation

The most common reason concrete sinks has nothing to do with the concrete itself. It comes down to what was (or wasn't) done before the concrete was poured.

Concrete is only as stable as the base beneath it. During new construction, the ground around a home gets dug up, moved around, and refilled. When that soil isn't properly compacted in layers before the forms go down, it continues to settle for years afterward. The slab on top has nothing to do but follow it down.

In busy new-build subdivisions, schedules are tight. Base material is often dumped, leveled, and poured over without the time-consuming compaction it really needs. The result is excessive settling of the base from original construction, which is the single biggest reason we get calls about sunken steps, service walks, patios, and driveways.

Extra Backfill on Hills and Elevation Changes Makes It Worse

Many Michigan homes are built on rolling lots, walkout basements, or graded sites where the builder had to bring in extra fill to raise the elevation or level out a slope. The deeper that loose backfill goes, the more room it has to compress over time.

This is why front porches and steps on raised homes, and patios off walkout basements, are some of the most common slabs we lift. A few inches of settling in a shallow base becomes a much bigger drop when there are several feet of poorly compacted fill underneath. Homes built on hillsides can also see soil slowly creep downhill, pulling slabs with it.

Excavation for Utility Lines

Gas, water, sewer, electric, cable, and fiber lines all have to get to the house somehow, and they usually run right under driveways, walkways, and aprons. When trenches are dug for these lines, before or after the concrete is poured, the soil that goes back in the trench is rarely compacted as tightly as the undisturbed ground around it.

Over time, that trench settles, and you'll often see a slab sink or crack along a clear line that follows the path of a utility run. Newer utility work, like fiber installations or line repairs, can cause the same problem years after the concrete was originally poured.

Excavation for Gutter Drains Under Service Walks

Another very common culprit is downspout drainage. Many homeowners and contractors bury drain lines to carry roof water away from the foundation, and those lines often run right under the service walk toward the yard or street. Just like utility trenches, the disturbed soil around these drains settles over time, leaving a dip in the walk right where the pipe crosses. Or even more common, someone digs the soil out to run one well after original construction, which almost always causes some settling of the service walk (don't worry, it's an easy fix for us)

Less Common Causes: Washout and Leaking Water

Water moving under a slab can carry soil away with it. This washout is less common than settling from poor compaction, but it does happen, usually from:

Downspouts discharging right next to or under a slab
Broken or leaking sprinkler lines
Cracked or separated drain pipes
Poor grading that sends water toward the concrete instead of away from it

When we see signs of washout, we'll point out the likely water source so it can be corrected. Lifting a slab without fixing the water problem only treats the symptom.

Tree Roots: When Concrete Goes Up Instead of Down

Not every uneven slab has sunk. Tree roots are a common reason sidewalks and service walks get pushed upward, creating raised edges and trip hazards. As roots grow, they can lift one edge of a slab above its neighbor. Mature trees close to driveways and walks are a frequent source of uneven concrete in established Michigan neighborhoods.

Michigan Winters: Freeze and Thaw Cycles

Michigan's climate is tough on concrete. Every winter, moisture in the soil freezes, expands, and pushes upward (frost heave), then thaws and softens again. We go through this freeze-thaw cycle many times each season, not just once.

These cycles hit hardest where the base was already weak or where water can get underneath the slab. Gaps along the edges of sunken concrete let even more water in, which freezes, expands, and makes the problem worse the following year. A small drop in the fall can turn into a much larger one by spring. Filling the voids and correcting the slope helps keep water from collecting under your concrete through the winter months.

Clay Soils, Sandy Soils, and Everything in Between

Soil conditions vary a lot across Michigan, sometimes from one side of a subdivision to the other.

Clay-heavy soils are common throughout much of Southeast Michigan. Clay holds water, swells when it's wet, shrinks when it dries out, and can be slow to drain, all of which put stress on concrete.
Sand-heavy soils, found in many parts of Livingston County and Central Michigan, drain well but can shift, wash out, and settle when they aren't compacted properly.

The good news is that our process handles both exceptionally well. We use a sand-based slurry made from mason sand, bentonite clay, and water, pumped beneath the slab through small, roughly one-inch injection holes. The slurry fills voids completely, conforms to whatever soil is under your concrete, and creates a solid, supportive base to raise the slab back into place. In our experience, it performs reliably in clay, sand, and mixed soils alike, without the added cost of polyurethane foam or full replacement. Once the slab is lifted, the holes are patched with a high-strength concrete patch that typically ages right along with the surrounding concrete.

What We See Every Day Across Michigan Subdivisions

No matter the cause, the same handful of problems show up in neighborhoods all across Southeast and Central Michigan:

Sinking front steps pulling away from the house or tilting toward the foundation
Uneven service walks with trip hazards between slabs
Sunken back patios that hold water or slope toward the home
Settled garage apron slabs that drop below the garage floor
Driveway and sidewalk slabs that have shifted out of alignment

We see these issues every week in Howell, Brighton, Hartland, Fowlerville, Pinckney, and throughout Livingston County, as well as across Oakland, Wayne, and Washtenaw counties and much of Mid-Michigan. If your home sits within about an hour and a half of Howell, we can help.

Why Lift Instead of Replace?

Tearing out and replacing concrete is expensive, messy, and disruptive, and if the base underneath isn't corrected, new concrete can settle just like the old. Concrete lifting (mud jacking) raises your existing slabs back to level, fills the voids underneath, and is usually completed in a fraction of the time. In our experience, homeowners typically save around 80% compared to replacement, and often 50 to 80% compared to polyurethane foam lifting.

MI Concrete Lifting is a licensed residential builder and fully insured, and our work is backed by a 3-year warranty. We've earned hundreds of 5-star reviews on Google, Facebook, Angi, Yelp, and other platforms by doing honest work and standing behind it.

Get a Free Estimate

If you're dealing with sinking steps, walks, patios, driveways, or garage aprons anywhere in Southeast or Central Michigan, we'd be glad to take a look and explain what's causing the problem and how we at Michigan Concrete Lifting can fix it.

For a free inspection, click HERE Or if you prefer, call or text 517-294-1815